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proc: disable mem_write after exec 

This change makes mem_write() observe the same constraints as mem_read().  This
is particularly important for mem_write as an accidental leak of the fd across
an exec could result in arbitrary modification of the target process' memory.
IOW, /proc/pid/mem is implicitly close-on-exec.

Signed-off-by: Stephen Wilson <wilsons@start.ca>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Stephen Wilson 2011-03-13 15:49:21 -04:00 committed by Al Viro
parent 5ddd36b9c5
commit 26947f8c8f
1 changed files with 4 additions and 0 deletions
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4
fs/proc/base.c
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@ -850,6 +850,10 @@ static ssize_t mem_write(struct file * file, const char __user *buf,
if (check_mem_permission(task))
goto out;
copied = -EIO;
if (file->private_data != (void *)((long)current->self_exec_id))
goto out;
copied = -ENOMEM;
page = (char *)__get_free_page(GFP_TEMPORARY);
if (!page)